XMI is a sophisticated specification (version 1.2 is over 400 pages), so, in this article, I will limit myself to the bare minimum description needed for automatic derivation.

It gives Ruby processors the minimum restriction to be a "Ruby". So even 1.8.7 needs stricter specification like RubySpec to keep compatibility between implementations.

This gives us an indication of the minimum amount of use case transactions in any use case specification: there are at least as many transactions as there are flows. 8.